[pve-devel] Default cache mode for VM hard drives

Dietmar Maurer dietmar at proxmox.com
Thu May 28 09:31:35 CEST 2015


> I have just done the same test with mdadm and not DRBD. And what I found
> that this problem was reproducible on the software raid too, just as it was
> claimed by Lars Ellenberg. It means that problem is not only related to
> DRBD but to O_DIRECT mode generally when we don't use host cache and a
> block device reads data directly from userspace.

We simply think the behavior is correct. If you want to be sure data is
on disk you have to call fsync.



More information about the pve-devel mailing list